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This is a sad commentary on the workplace today, but unfortunately in the current climate with people complaining even when someone sneezes because they have become overly sensitive, even the most minor one time gesture can lead to workplace issues.
A single instance of conduct or isolated comment is not legally sexual harassment. In fact, you had a very non-sexual reason for the conduct and it was neither an unlawful touching or sexual harassment and you are going to have to express that clearly to HR. You should NOT attack her workplace behavior, but you should mention she has asked you in the past about putting the band aid on her back and this was merely done to prevent her from losing property and you need to maintain you did not actually touch her, you touched her debit card that was falling from her pocket.
IF they were to try to terminate you over this, you would have at least grounds to challenge their investigation as negligent and that one isolated incident does not create sexual harassment.
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